Change computer



P. E. KOPP.

CHANGE COMPUTER.

APPLICATION FILED JUNE 30.1921.

1 ,4: 1 O, 1 95. Pate ted Mar 21, 1922.

UNITED 'sTArE s 5rENT OFFICE.

PHILIP E. KOPI, OF KANSAS CITY, MISSOURI.

CHANGE COMPUTER.

Application filed June 30,

To all whom it may concern:

Be it known that I, PHILIP E. IiOPP, a citizen of the United States, iresiding at Kansas City, in the county of Jackson and State of Missouri, have invented a certain new and useful Improvement in Change Computers, of which the following is a complete specification.

This invention relates to change com puting charts and has for its object to produce a sliding chart of such character that the amount of change for any amount less than $1.00 may be rapidly and accurately computed. I

A. further object is to produce a scale of this character which can beadapted fol-use with a rotating drum or which can be made in the form of a metal or paper strip.

Another object is to produce a chart which is simple and comparatively cheap of manufacture, and in order that it may be fully understood, reference is to be had to the accompanying drawing, in which Figure 1 is a face view of the chart with the sliding scale in position. 1

Figure 2 is a continuation of the chart as shown in Figure 1.

Figure 3 is a section on the line III- H1 of Figure 1.

Figure 4 is an inverted rear perspective view of the sliding scale.

Figure 5 is a face view of a modified form of the device.

The deviceof the invention, as illustrated in the drawing, consists essentially of a ircctangular strip 1 of wood, metal or other suitable material, and is transversely divided into 101 horizontal rows, each row after the first one being marked in a vertical column at the left hand side of the chart with numerals indicating cents, beginning with .01 and ending with 1.00.

The scale,as i.llus trated, is provided with thirteen additional columns besides the cents Specification of Letters Patent.

Patented Mar. 21, 1922.

1921. Serial No. 481,523.

5, 1, 1, l, and 1, to indicate $.05, $.01, $.01, $.01, and*$.01.

The remainder of the chart is thus blocked out by the columns and rows into a series of squares, certain of the squares corresponding to a predetermined column and row being colored distinctively from the remaining squares, said color-being applied in accordance with a predetermined plan in order that when the sliding scale is used, the colors shall appear through perforations in the latter as will hereinafter appear.

The sliding scale consists of a plate 2, preferably-of metal and provided at one side with a right-angle shaped arm 3 adapted to engage one side edge of. the chart, and at the other edge with a pair of hooks 1 adapted to engage the opposite edgeof the chart. It will, of course, be understood that the arm and hooks not merely as guides in the sliding of the scale and also to hold the scale at any desired point of adjustment. By referring to the drawing, Figure 1, it will be notedthat the scale is of such width that it will not hide or coverithe first two vertical columnsappearing on the chart.

The scale 2 is provided with twelve vertical columns and twenty-one horizontal rows. The first column beginning with the second row is marked with the figures .05, and each row in said column isthereafter marked with figures increasing by 5 until the number 1..00 is attained, and said figures respectively indicate amounts ranging from $05 to $1.00. The remaining columns are provided with markings corresponding to the coinciding columns of the chart, and said markings occupy the uppermost row of the scale as described in connection with the chart.

The scale is thus blocked out by the rows and columns into a' series of squares, certain of which are perforated as at 5 in accordance with a predetermined plan, and the colored squares of the chart may be seen through said after appear. y

The operation of the chart is, as follows: For example, a purchaser buys something of the value of $.60 and pays $.75, he should receive $.15 in change. The cashier will immediately slide the scale on the chart until the number .7 5 coincides with the row marked 60 in the first column of the chart.

perforations as will hereinlie will then give the change in amount corresponding to the total value of all the col.- unins in which a color appears through a perforation in said .75 row which, in this instance. will be 10 and 5, ii'idicatingg; that $.15 should be given in change. Also for exznnple, a purchaser pays $1.00 for something oi the value olf Reterring; to the colors appearing through the perforations in the scale and the figures at the top ot the corres 'iouding columns, it will, be seen that the columns corresponding to the Figures 25, 5 and 5, appear in. color, indicating that $.35 should be given in change.

ln the modified term of the devic as shown in Figure 5, the chart consists ol a pair oi members (3 and T identified in a similar manner to the chart 1. The scale instead of being composed of one member divided into rows, consists of twenty scale members respectively identified from .05 to 1.00, and each is provided at one side with a riglitangle shaped arm 9, and at the, other with apan oi arms ll) O'l similar character, as illustratml, to act as guides and is separately slidable on the scales, as will be readily understood.

From the above description it will be apparent that I have produced a change computer possessing all o'l the features of advantage pointed out as desirable, and while l have described and claimed the preferred embodiment of the same, I reserve the right to make all. changes properly falling within. the spirit and scope 0i. the appended claims.

I claim 1. In a change computer, the combination ot a pair of relatively movable u'ien'ibers, one oi said members being provided with a vertical column olf eqni-spaced figures increasing by one and dividing said member into horizontal rows, and with a plurality oi change-indicatin 1; columns intersecting: the said rows, certain ii'itersicting points in said columns and rows being distinctivelv i lentilied; the second member oi" said pair, being provided with a vertical column of figures increasing by five and d'viding it into horizontal rows, and with a plurality of columns coinciding with the cl tinge-indicatingcolumns 01 said first member; said second member also being provided with a plurality of means in each row for cooperating with con tain (it the distinctivelyidentified points of said first member, the total value Oil the dis tinctivelvidentified points in a row olf said first member cooperating with a row oi the means of said second. member, equaling in amount the dillerence between the amounts of the figures oi the vertical columns 0'! said members appearing in the plane of such cooperating rows.

2. In a change computer, the combination of? a pair oi relatively movable members, one ol said members being provider with a vertical column of equi spaced figures increasing by one and dividing said member into horizontal rows, and with a plurality n"- change indieating columns intersecting the said rows, certain intersectinc' points in said columns and rows being distinctively identified; the second member (it said pair being; }')J'0v'ltl0(l with a vertical column of figures spaced apart an equal distance to the distance between the figures oi the vertical. cehnnn oi the first member and increasing by live and dividing said member into horizontal rows, and with a plurality of columns coinciding with the columns oi? said first member, said second member being also urovided with a plurality of perforations in each row for exposing certain oi the distinctively identified points of the firstnamed member, the total value oi. distinc tively identified points of the first member exposed in one row by a certain row of periterations in the second member, equaling the difference between the amounts oi? the figures of the vertical columns oil? said members ap icaring in the plane of such row.

3. in a change cinnputer, the combination oil. a chart and a scale, the former being composed ot a pluralitv oil men'ibers, one o'l" said members being provided with a vertical colun'm oi equi-s iaced figures increasing by one and dividing said member into horizontal rows, said rows coinciding with similar rows on the other members, and each mem her having a plurality of change indicating columns intersecting said rows, certain intersecting points in said columns and rows being distinctively identiliedg. the scale being provided with a vertical columns of: similarly equi-spaced figures increasing by live and dividing said member into horizontal rows, and with a plurality 01' columns coinciding with the columns ol? said chart, said scale being also provided with a plurality ct perforations for exposing certain of the distinctively identified points of the chart, the total. value o'l? distinetivclv identified points oi. the first member exposed in one row b v a certain row ol perloral'ions in the second. mei'nber, equaling the ilill'erencc between the amounts of the figures o l;' the vertical columns ol said members appearing in the plane oi? such row. i

-il-. In a change computer, the combination of a chart and a scale, the former being provided with a vertical columns oil? equiss paced figures increasing by one and dividing said meml: r into horizontal rows, and with a plurality of change indicating columns intersertinc; said rows, certain interse :ting' points in said columns and rows being): distinctively identified; the scale being composed ot a plurality of members, each adapted for sliding; engagement with the chart. and each bearing an identiitvingnumber and with a pli-u'alitv ot columns coinciding: with the second member, equaling the difference between the amounts of the figures of the vertical columns of said members appear- 10 ing in the plane of such row.

In Witness whereof I hereunto alfix my signature. PHILIP E KOPP. 

